Northern highbush blueberry bush varieties are native to the eastern and northeastern United States. They grow to between 5-9 feet (1.5-2.5 m.) in height. They require the most consistent pruning of the blueberry varieties. Northern highbush blueberries are generally self-fertile; but you'll get larger and earlier ripening berries if you plant several different cultivars (varieties) close by for cross-pollination.